2121523 has 4 divisors (see below), whose sum is σ = 2130568. Its totient is φ = 2112480.

The previous prime is 2121503. The next prime is 2121529. The reversal of 2121523 is 3251212.

2121523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2121523 - 2⁹ = 2121011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121497 and 2121506.

It is not an unprimeable number, because it can be changed into a prime (2121529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4161 + ... + 4642.

It is an arithmetic number, because the mean of its divisors is an integer number (532642).

2^2121523 is an apocalyptic number.

2121523 is a deficient number, since it is larger than the sum of its proper divisors (9045).

2121523 is an equidigital number, since it uses as much as digits as its factorization.

2121523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9044.

The product of its digits is 120, while the sum is 16.

The square root of 2121523 is about 1456.5448843067. The cubic root of 2121523 is about 128.4939208921.

Adding to 2121523 its reverse (3251212), we get a palindrome (5372735).

The spelling of 2121523 in words is "two million, one hundred twenty-one thousand, five hundred twenty-three".